UcdParseTask

class lsst.obs.lsst.ucd.UcdParseTask(config, *args, **kwargs)

Bases: lsst.obs.lsst.ingest.LsstCamParseTask

Parser suitable for UCD data.

We need this to parse the UC Davis headers.

Methods Summary

emptyMetadata()	Empty (clear) the metadata for this Task and all sub-Tasks.
getAllSchemaCatalogs()	Get schema catalogs for all tasks in the hierarchy, combining the results into a single dict.
getDestination(butler, info, filename)	Get destination for the file
getExtensionName(md)	Get the name of an extension.
getFullMetadata()	Get metadata for all tasks.
getFullName()	Get the task name as a hierarchical name including parent task names.
getInfo(filename)	Get information about the image from the filename and its contents
getInfoFromMetadata(md[, info])	Attempt to pull the desired information out of the header.
getName()	Get the name of the task.
getSchemaCatalogs()	Get the schemas generated by this task.
getTaskDict()	Get a dictionary of all tasks as a shallow copy.
makeField(doc)	Make a lsst.pex.config.ConfigurableField for this task.
makeSubtask(name, **keyArgs)	Create a subtask as a new instance as the name attribute of this task.
timer(name[, logLevel])	Context manager to log performance data for an arbitrary block of code.
translate_date(md)	Retrieve the date of observation as an ISO format string.
translate_dateObs(md)	Retrieve the date of observation as an ISO format string.
translate_dayObs(md)	Generate the day that the observation was taken.
translate_detector(md)	Extract detector ID from metadata
translate_detectorName(md)	Extract ccd ID from CHIPID.
translate_expTime(md)
translate_filter(md)	Translate a full filter description into a mere filter name
translate_imageType(md)
translate_lsstSerial(md)
translate_object(md)
translate_raftName(md)	Extract raft ID from CHIPID.
translate_run(md)
translate_snap(md)	Extract snap number from metadata.
translate_testSeqNum(md)	Translate the sequence number
translate_visit(md)
translate_wavelength(md)	Translate wavelength provided by teststand readout.

Methods Documentation

emptyMetadata()

Empty (clear) the metadata for this Task and all sub-Tasks.

getAllSchemaCatalogs()

Get schema catalogs for all tasks in the hierarchy, combining the results into a single dict.

Returns:

schemacatalogs : dict

Keys are butler dataset type, values are a empty catalog (an instance of the appropriate lsst.afw.table Catalog type) for all tasks in the hierarchy, from the top-level task down through all subtasks.

Notes

This method may be called on any task in the hierarchy; it will return the same answer, regardless.

The default implementation should always suffice. If your subtask uses schemas the override Task.getSchemaCatalogs, not this method.

getDestination(butler, info, filename)

Get destination for the file

@param butler Data butler @param info File properties, used as dataId for the butler @param filename Input filename @return Destination filename

static getExtensionName(md)

Get the name of an extension. @param md: PropertySet like one obtained from lsst.afw.fits.readMetadata) @return Name of the extension if it exists. None otherwise.

getFullMetadata()

Get metadata for all tasks.

Returns:

metadata : lsst.daf.base.PropertySet

The PropertySet keys are the full task name. Values are metadata for the top-level task and all subtasks, sub-subtasks, etc..

Notes

The returned metadata includes timing information (if @timer.timeMethod is used) and any metadata set by the task. The name of each item consists of the full task name with . replaced by :, followed by . and the name of the item, e.g.:

topLevelTaskName:subtaskName:subsubtaskName.itemName

using : in the full task name disambiguates the rare situation that a task has a subtask and a metadata item with the same name.

getFullName()

Get the task name as a hierarchical name including parent task names.

Returns:

fullName : str

The full name consists of the name of the parent task and each subtask separated by periods. For example:

• The full name of top-level task “top” is simply “top”.
• The full name of subtask “sub” of top-level task “top” is “top.sub”.
• The full name of subtask “sub2” of subtask “sub” of top-level task “top” is “top.sub.sub2”.

getInfo(filename)

Get information about the image from the filename and its contents

Here, we open the image and parse the header, but one could also look at the filename itself and derive information from that, or set values from the configuration.

@param filename Name of file to inspect @return File properties; list of file properties for each extension

getInfoFromMetadata(md, info=None)

Attempt to pull the desired information out of the header.

Parameters:

md : lsst.daf.base.PropertyList

FITS header.

info : dict, optional

File properties, to be updated by this routine. If None it will be created.

Returns:

info : dict

Translated information from the metadata. Updated form of the input parameter.

Notes

This is done through two mechanisms:

• translation: a property is set directly from the relevant header

  keyword.

• translator: a property is set with the result of calling a method.

The translator methods receive the header metadata and should return the appropriate value, or None if the value cannot be determined.

This implementation constructs an ObservationInfo object prior to calling each translator method, making the translated information available through the observationInfo attribute.

getName()

Get the name of the task.

Returns:

taskName : str

Name of the task.

See also

getFullName

getSchemaCatalogs()

Get the schemas generated by this task.

Returns:

schemaCatalogs : dict

Keys are butler dataset type, values are an empty catalog (an instance of the appropriate lsst.afw.table Catalog type) for this task.

See also

Task.getAllSchemaCatalogs

Notes

Warning

Subclasses that use schemas must override this method. The default implemenation returns an empty dict.

This method may be called at any time after the Task is constructed, which means that all task schemas should be computed at construction time, not when data is actually processed. This reflects the philosophy that the schema should not depend on the data.

Returning catalogs rather than just schemas allows us to save e.g. slots for SourceCatalog as well.

getTaskDict()

Get a dictionary of all tasks as a shallow copy.

Returns:

taskDict : dict

Dictionary containing full task name: task object for the top-level task and all subtasks, sub-subtasks, etc..

classmethod makeField(doc)

Make a lsst.pex.config.ConfigurableField for this task.

Parameters:

doc : str

Help text for the field.

Returns:

configurableField : lsst.pex.config.ConfigurableField

A ConfigurableField for this task.

Examples

Provides a convenient way to specify this task is a subtask of another task.

Here is an example of use:

class OtherTaskConfig(lsst.pex.config.Config)
    aSubtask = ATaskClass.makeField("a brief description of what this task does")

makeSubtask(name, **keyArgs)

Create a subtask as a new instance as the name attribute of this task.

Parameters:

name : str

Brief name of the subtask.

keyArgs

Extra keyword arguments used to construct the task. The following arguments are automatically provided and cannot be overridden:

• “config”.
• “parentTask”.

Notes

The subtask must be defined by Task.config.name, an instance of pex_config ConfigurableField or RegistryField.

timer(name, logLevel=10000)

Context manager to log performance data for an arbitrary block of code.

Parameters:

name : str

Name of code being timed; data will be logged using item name: Start and End.

logLevel

A lsst.log level constant.

See also

timer.logInfo

Examples

Creating a timer context:

with self.timer("someCodeToTime"):
    pass  # code to time

translate_date(md)

Retrieve the date of observation as an ISO format string.

Parameters:

md : PropertyList or PropertySet

Image metadata.

Returns:

dateObs : str

The date that the data was taken in FITS ISO format, e.g. 2018-08-20T21:56:24.608.

translate_dateObs(md)

Retrieve the date of observation as an ISO format string.

Parameters:

md : PropertyList or PropertySet

Image metadata.

Returns:

dateObs : str

The date that the data was taken in FITS ISO format, e.g. 2018-08-20T21:56:24.608.

translate_dayObs(md)

Generate the day that the observation was taken.

Parameters:

md : PropertyList or PropertySet

image metadata

Returns:

dayObs : str

The day that the data was taken, e.g. 1958-02-05.

translate_detector(md)

Extract detector ID from metadata

Parameters:

md : PropertyList or PropertySet

Image metadata.

Returns:

detID : int

Detector ID, e.g. 4.

translate_detectorName(md)

Extract ccd ID from CHIPID.

Parameters:

md : PropertyList or PropertySet

Image metadata.

Returns:

ccdID : str

Name of ccd, e.g. S01.

translate_expTime(md)

translate_filter(md)

Translate a full filter description into a mere filter name

Besides being an example of a translator, this is also generally useful. It will only be used if listed as a translator in the configuration.

translate_imageType(md)

translate_lsstSerial(md)

translate_object(md)

translate_raftName(md)

Extract raft ID from CHIPID.

Parameters:

md : PropertyList or PropertySet

Image metadata.

Returns:

raftID : str

Name of raft, e.g. R21.

translate_run(md)

translate_snap(md)

Extract snap number from metadata.

Parameters:

md : PropertyList or PropertySet

Image metadata.

Returns:

snap : int

Snap number (default: 0).

translate_testSeqNum(md)

Translate the sequence number

Sometimes this is present, sometimes it is not. When it is, return it as an int. When it’s not, provide a default value of 0 as an int. This function exists because currently the Gen2 butler’s default value providing pathway has trouble with types.

Parameters:

md : PropertyList or PropertySet

Image metadata.

Returns:

seqNum : int

The seqNum, with a default value of 0 if required

translate_visit(md)

translate_wavelength(md)

Translate wavelength provided by teststand readout.

The teststand driving script asks for a wavelength, and then reads the value back to ensure that the correct position was moved to. This number is therefore read back with sub-nm precision. Typically the position is within 0.005nm of the desired position, so we warn if it’s not very close to an integer value.

Future users should be aware that the HIERARCH MONOCH-WAVELENG key is NOT the requested value, and therefore cannot be used as a cross-check that the wavelength was close to the one requested. The only record of the wavelength that was set is in the original filename.

Parameters:

md : PropertyList or PropertySet

Image metadata.

Returns:

wavelength : int

The recorded wavelength in nanometers as an int.